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Most guitars have a somewhat "dull" sound, mainly due to the low amplitude of the higher order harmonics generated by them. The proposed circuit corrects this deficiency, thus giving a shine to the sound produced. At low frequencies (from 40 to 300 Hz) the circuit has a practically unity gain. However, when the frequency exceeds 500 Hz, the feedback, through the T-bridge, is reduced, thus increasing the amplifier gain. The output reaches a maximum of 23 dB at 4.8 Khz, which corresponds to a gain of 15. The IN transistor is BC 549 and the OUT is BC 557. The 100 Pf capacitor is ceramic and the others are metallic polyester.
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